The development of clean, reliable and cost-effective electrochemical processes must be guided by three equally important fundamental principles: improving the catalytic activity of electrode materials, increasing their long-term stability in harsh electrochemical environments and high selectivity for targeted products. Although our current understanding on the electrochemical interface has rendered great improvement in activities for a range of energy related processes, such as those involved in Fuel Cells and Electrolyzers, we still lack the same level of control over the stability and selectivity aspects of the catalysis. One of the limitations is the ability to measure in situ and in real time how species are being generated while the reactions are taking place, a key element for understanding the dynamics of the processes beyond steady-state conditions. For that, we developed a unique experimental setup that adds to the existing rotating disk configuration the capability to observe the species produced during catalysis. The Stationary Probe Rotating Disk Electrode (SPRDE) enables a seamless connection between electrocatalysis and high-end mass spectrometers that gives us the opportunity to measure with precision the dissolution rates of almost any element of the periodic table (combination with ICP-MS). This new methodology offers advantages over flow cell systems and it can be readily applied in understanding electrochemical dissolution processes that occur during fuel cell and electrolyzer catalysis, dealloying processes, corrosion, and battery research.